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本科生毕业设计（论文）题目：铝涂层在饱和氧环境下的深海腐蚀性能研究2019年5月31日摘要在海水腐蚀防护领域，越来越多的开始采用热喷涂金属涂层或牺牲阳极系统保护。但是深海中相对苛刻的腐蚀环境和相关经验理论的缺失使人们在采用防腐蚀保护措施时缺乏足够的理论支持，以及深海中施工、检测、维修的不易实现性和高额成本，这些都要求了深海需要更加可靠的保证性。所以就要求我们在降低成本的同时尽可能提高阴极保护的可靠性。也就是说如何在保证防腐要求时，降低牺牲阳极块的重量或采用适当方式合理替代牺牲阳极就具有重要的工程意义。本文尝试利用铝涂层来替代铝基牺牲阳极以达到减少阳极用量的目的。通过试验室加速模拟低温海洋腐蚀试验，研究其耐腐蚀性能，分析、探讨其腐蚀行为，并对铝涂层在不同阴极保护条件下的腐蚀速率进行了研究，尝试对其寿命进行评估。研究表明，在饱和氧环境下，铝涂层有较好的腐蚀防护效果。替代方式的寿命均高于牺牲阳极块的寿命，其中阳极块+涂层的防护方式能更大程度地延长双方的寿命。通过对试样腐蚀形貌的观察，可以发现，在饱和氧环境下，铝基牺牲阳极在阴极保护初期极化时间短，腐蚀电流较大，寿命较短；铝涂层表面持续钝化，寿命较长；在阳极+涂层中，腐蚀电流较小，涂层更易钝化，寿命进一步延长。关键词：牺牲阳极，涂层，电弧喷涂，腐蚀与防护CorrosionBehaviorofZn/AlBasedSacrificialAnodeCoatingsinSimulatedLow-temperatureSeaEnvironmentAbstractInthefieldofseawatercorrosionprotection,moreandmorestartusingthermalsprayingmetalcoatingorsacrificialanodeprotectionsystem.Butrelativelyharshindeepseacorrosionenvironment,thelackofexperienceandrelevanttheorymakepeopleinthecorrosionprotectionmeasureswhenthelackofsufficienttheoreticalsupport,anddeepintheconstruction,testing,maintenanceisnoteasytorealizeandhighcost,thisrequiresadeepneedtobemorereliableguarantee.Sotheyaskedustoreducethecostasmuchaspossibletoimprovethereliabilityofcathodicprotectionatthesametime.Thatishowtoguaranteetheanti-corrosionrequirements,reducetheweightofthesacrificialanodeblocksoruseappropriatewayreasonablealternativesacrificialanodehasimportantengineeringsignificance.Thispapertriestousealuminuminsteadofaluminumsacrificialanodecoatinginordertoreducethedosageofanode.ThroughlaboratoryacceleratedsimulatedMarinecorrosiontestatlowtemperature,tostudythecorrosionresistanceandthecorrosionbehaviorisanalyzedanddiscussed,andthealuminumcoatingunderdifferentconditionsofcathodicprotectionofthecorrosionratewasstudied,andtrytoevaluateitslife.Studieshaveshownthatunderallkindsofatmosphere,thealuminumalloyanodecoatingprotectiveeffectisbetter;Underthesaturationofoxygen,aluminumcoatinghasgoodcorrosionprotectioneffect.Alternativewaysarehigherthanthelifeofapieceofthelifeofthesacrificialanodeandtheanodeblock+coatingprotectivewaymoretoprolongthelifeofbothsides.Throughobservationofthespecimencorrosionmorphology,whichcanbefoundthat,underthesaturationofoxygen,aluminumsacrificialanodepolarizationshorttimeatthebeginningofthecathodicprotection,corrosioncurrentisbigger,lifeisshort;Aluminumcoatingthesurfacepassivationcontinuously,lifeislong;Inanode+coating,corrosioncurrentsmaller,easiertopassivationcoating,furtherextendtheservicelife.Keywords:sacrificialanode,coating,arcspraying,corrosionandprotection目录第一章绪论..................................................................................................................11.1深海环境腐蚀机理.....................................................................................................11.1.1深海环境腐蚀特性..................................................................................11.1.2深海开发的必要性..................................................................................11.1.3深海常用结构材料..................................................................................11.2阴极保护.....................................................................................................................21.2.1阴极保护技术..........................................................................................21.2.2阴极保护系统的设计..............................................................................21.2.3牺牲阳极的阴极保护..............................................................................21.3涂层腐蚀防护技术.....................................................................................................41.3.1腐蚀防护涂层的选用依据......................................................................41.3.2有机涂层..................................................................................................41.3.3热喷涂金属涂层......................................................................................41.3.4复合涂层..................................................................................................51.4本文研究目的及研究内容.........................................................................................51.4.1研究目的及意义......................................................................................51.4.2本文的研究内容......................................................................................6第二章试验材料及试验方法........................................................................................72.1试验材料.....................................................................................................................72.2电弧喷涂铝涂层.........................................................................................................82.3铝基牺牲阳极.............................................................................................................92.4铝基阳极涂层的作用原理.......................................................................................102.5腐蚀试验...................................................................................................................112.5.1腐蚀试验设备........................................................................